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i was going through the accel web site and came accross an opti-spark for the LT1. i thought MSD only made after market optisparks for the LT1s?
 

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They came out about the same time the MSD did. They get mixed results as does the MSD . Still a safe bet to go with the GM opti when needing to replace one. Just remember to locktite the rotor to prevent problems down the road.
 

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I got one on "Wytltng". Been running for two years minus winter storage. Have had no problems. Reason I went used this compared to Delco was it was cheaper. I also use the ignition control box, coil, & module as well.
 

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